Supercharged Euro M52B20

[ivladoff]

Hi all you guys!

First of all, sorry for my bad english, I'm from Eastern Europe- Bulgaria.


It’s been long time since I’ve been reading this forum, and I’ve really got a lot of useful information about FI, but I still have a lot of questions.
What I’ m planning to do is to supercharge my M52B20, (2000cc euro version). It has Siemens ECU.
I already have S52B32US camshafts on it and gained some power even without any ECU modification. And I also have custom exhaust headers.
Recently I’ve bought supercharger Eaton M62 from Mercedes CLK320 which is smaller unit and will fit in my e36.
My aim is to build reliable daily driver, not looking for some huge HP gain.
Here in Europe the general feeling is that M52 is not a good base for FI because of its aluminum block. In general there is no even single FI M52 in Bulgaria. Despite this is one of the BMW popular engines here. But as I can see in US there is many people driving supercharged or turbocharged M52. So you may help me to prove they are wrong.
So my questions are:
If I run this supercharger on small boost as a beginning, up to 7psi will I need:
-Forged pistons and rods
-What engine management? Will custom chip tuning be OK?
-Will VANOS create any problems?
-Where should I put the throttle body, before or after the supercharger.
-What MAF should I use, the stock one or should have go for Porshe/540?
-
I also have multi throttle bodies from euro S52B32, but still wonder if there will be any benefit of them under FI. I read about such setup here, but it was mentioned about blow off between supercharge and TB’s. Should I use them or it’ s pain in the ass.
Thank you!

[enda320]

ok - first, just a note to the US members, euro M52's were alloy block, as opposed the your better Iron ones

The alloy blocks have a tendency to strip the threads when trying to torque the head down, so be careful.
For 7psi, you should be OK on stock internals. You can't do a chip swap on the MS41, so you'll need to get a tuner to reflash it instead. Vanos will be OK, the best place for a throttle is before the charger, but having it after is OK, and this is what most people do
Maf - you'll probably need something bigger, you might get away with a 328 maf if they are much bigger, these can handle up to 250bhp easy, probably quite a bit more, and i'd imagine 7psi should get you about 220bhp.

Multithrottles - i haven't seen anyone get these on a non M block, there is a pic on a non vanos 325 with TB's but i can't make out if they are dbilas or M power stuff.
to fit them, you'd need an adaptor plate (there are pics and dimensions about) and the M3 oil filter housing as the TB's won't clear the usual one.
If anyone has more details of fitting the S50 throttles, i'd be interested too

[kaliE36]

Hi,
-Forged pistons and rods
Not necessary for 7psi; I was boosted the same engine type with 12psi
-What engine management? Will custom chip tuning be OK?
Yes
-Will VANOS create any problems?
Not related with FI
-Where should I put the throttle body, before or after the supercharger.
Being a volumetric supercharger, is recommended to install the TB before the spg.
-What MAF should I use, the stock one or should have go for Porshe/540?
You should talk with who will make your cip-tuning (you can use the stock MAF unit, but scaled - there are some discussions on this forum about how to do this)
-I also have multi throttle bodies from euro S52B32, but still wonder if there will be any benefit of them under FI.
ITB is a tricky thing to install/ calibrate to really gain some HP, anyway, in your volumetric spg setup is not so recommended to use TB/ ITB after the spg, so ...
If you really want to do this, you can design a setup with a by-pass and use ITBs - but is complicated, and I don't really think that is worted
M62 is notorious for heat "production" - so I will suggest you to think about to include a intercooler in your calculations
You will also need some bigger injectors ... from a M3 by example

[kaliE36]

Multithrottles - i haven't seen anyone get these on a non M block, there is a pic on a non vanos 325 with TB's but i can't make out if they are dbilas or M power stuff.
to fit them, you'd need an adaptor plate (there are pics and dimensions about) and the M3 oil filter housing as the TB's won't clear the usual one.
If anyone has more details of fitting the S50 throttles, i'd be interested too
The best solution to mount S50 ITBs on M50 engines that we found here is to weld ITBs to a aluminum flange and cut the holes for screws as the M50 intake part of the head is ... is difficult and require precision work, and is recommended to be done with the head removed, to be able to port the flange/ ITB/ cilhead to fit perfectly
and, you're right that you also need the M3 oil filter
You also need to shave in some places 1-2 mm from the cilhead side to have enough clearance
i will search for some pictures with the setup ..

[ivladoff]

Well, I tought all M52 are with aluminum block. That's why they don't boost them here. About the ITBs I know there is need of modification and shorter oil filter (M20) is also good as I know.
So I will look for 328 MAF, it' s easy to find I think, I also have larger throttle body (ITBs will wait at this stage) and will add intercooler (have someone ever heared about Mishimoto?) Finally will find remap the ECU and hopefully this aluminum block will survibe 7psi.

[jokerthepoker]

in engineering studies, the aluminum block was category as HEAVY duty engine block.
specially Alusil (Aluminum Silicone alloy), better than Magnasium alloy.

eg, the FORGED racing PISTON was Aluminum-Silicone alloy,

i am not sure the M52 aluminum block was pure oxide aluminum or alusil alloy.
the possible problem was the fasterner tread in the block for cylinder head and crankshaft may wreck if over stress ??? ,

the thin heat-treated aluminum ladder with aluminum rivet (cold work) can support 100+++ KG of load.